Chapter 33 Notes - Control in Plants

Chapter 33 Control Systems in Plants 0

[object Object],[object Object],[object Object]

[object Object],[object Object],CH 3 OH HO HO O OH OH O Estrogen (Estradiol) Phytoestrogen (Genistein) Chemical structures of a human estrogen and a plant phytoestrogen

[object Object],[object Object],Soybeans

PLANT HORMONES ,[object Object],[object Object],[object Object],Figure 33.1A

[object Object],[object Object],Figure 33.1B Shaded side of shoot Illuminated side of shoot Light

[object Object],[object Object],[object Object],Figure 33.1C Light Control Tip removed Tip covered by opaque cap Tip covered by trans- parent cap Base covered by opaque shield Tip separated by gelatin block Tip separated by mica Darwin and Darwin (1880) Boysen-Jensen (1913)

[object Object],[object Object],[object Object],[object Object],Figure 33.1D Agar Shoot tip placed on agar block. Chemical (later called auxin) diffuses from shoot tip into agar. Other controls: Blocks with no chemical have no effect. Offset blocks with chemical stimulate curved growth. Control Block with chemical stimulates growth. No light

[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],Figure 33.3A, B Roots Stems 0 0.9 g/L   10 – 8 10 – 6 10 – 4 10 – 2 1 10 2 Increasing auxin concentration (g/L) Elongation Inhibition Promotion

[object Object],[object Object],Plasma membrane Cell wall H + 1 2 H + 3 H 2 O Vacuole Cell elongation Cellulose loosens; cell can elongate Cellulose molecule Cross-linking molecule Enzyme Cellulose molecule Cell wall Cytoplasm H + pump (protein) Figure 33.3C

[object Object],[object Object]

[object Object],[object Object],Figure 33.4 Terminal bud No terminal bud

[object Object],[object Object],[object Object],Figure 33.5A

[object Object],[object Object],[object Object],Figure 33.5B

[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],Figure 33.6

[object Object],[object Object],[object Object],Figure 33.7A 1 2 3

[object Object],[object Object],[object Object],[object Object],Figure 33.7B Leaf stalk Stem (twig) Abscission layer Protective layer Stem Leaf stalk LM 20 

CONNECTION ,[object Object],[object Object],[object Object],Figure 33.8

Chapter 33 Notes - Control in Plants

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